import React from 'react'
export default class Book extends React.Component{
    constructor(props){
       super(props);
  
       this.state={
     
       }

    }
   
    render(){
    
      return <div>
     <h4 style={{color:"red"}}>欢迎来到图书馆</h4>
      </div>
    }
 
        

    

  }
